#include <iostream>
#include <cstring>
#include <unistd.h>
#include <stdio.h>
int main()
{

    printf("hello printf\n");
    fprintf(stdout, "hello fprintf\n");
    const char *buff = "hello fwrite\n";
    fwrite(buff, strlen(buff), 1, stdout);

    // 系统调用
    const char *ss = "hello write\n";
    write(1, ss, strlen(ss));

    //
    fork();
    return 0;
}
